Continuously variable transmission used for forklift

Abstract

The invention relates to a continuously variable transmission used for a forklift. The continuously variable transmission comprises an engine, a first gear, a second gear, a third gear, a fourth gear,a fifth gear, a sixth gear, a seventh gear, an eighth gear, a planet gear mechanism A, a ninth gear, a tenth gear, an eleventh gear, a twelfth gear, a first hydraulic pump / motor and a second hydraulic pump / motor. The second gear is in transmission connection with a transmission shaft of the first hydraulic pump / motor. The twelfth gear is connected with the second hydraulic pump / motor through a first transmission shaft. The fourth gear is in transmission connection with the sixth gear through a first clutch. The fifth gear is in transmission connection with the seventh gear through a second clutch. The eighth gear is connected to a planet gear carrier of the planet gear mechanism A through a second transmission shaft. A gear ring of the planet gear mechanism A is in transmission connectionwith the twelfth gear. A sun gear of the planet gear mechanism A is in transmission connection with the ninth gear through a third transmission shaft. The continuously variable transmission has the beneficial effects of being high in transmission efficiency, stable in operation and low in cost.

Description

technical field [0001] The invention relates to a continuously variable transmission device for a forklift, which belongs to the technical field of forklifts. Background technique [0002] The driving conditions of forklifts are complex, requiring frequent starting, shifting, stopping, and reversing. The performance of the forklift transmission system determines the starting / accelerating ability, operating stability, comfort, energy consumption and other important indicators to measure the performance of forklifts. At present, there are three mainstream transmission technologies for internal combustion forklifts, namely mechanical transmission, hydraulic transmission, and hydrostatic transmission. The transmission routes are as follows: [0003] Mechanical transmission: engine→multi-speed gear transmission controlled by clutch or synchronizer→drive axle. [0004] Hydraulic transmission: engine→hydraulic torque converter→single-speed reducer or multi-speed gear transmission→...

AI Technical Summary

Problems solved by technology

[0006] The mechanical transmission gearbox has the advantages of the highest transmission efficiency and low cost; but it has small starting torque, difficult starting and shifting operations, and poor comfort, so it is only used in small-tonnage low-end forklifts

[0007] Hydraulic transmission has large starting torque, easy operation, and moderate cost. It is the most widely used technology in the market at present; however, due to the very low transmission efficiency of the torque converter during starting and acceleration, the energy consumption is the largest among several transmission modes. It is especially prominent on forklifts that need to start and accelerate frequently

[0008] Hydrostatic transmission has large starting torque, stable acceleration, easy and precise operation, continuously variable speed ratio, the best comfort, and transmission efficiency between hydraulic transmission and mechanical transmission, but the cost is the highest among several transmission methods, especially Especially in large-tonnage forklifts, due to the need to take into account low-speed, high-torque traction and high-speed driving requirements, high-power pumps and motors are required, and the cost problem is more prominent.

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